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        <title>Document</title>
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            // Promise.race

            function PromiseRace(promises) {
                return new Promise((resolve, reject) => {
                    if (!Array.isArray(promises)) {
                        return reject(new Error('输入的参数必须是数组'));
                    }
                    promises.forEach((prom) => {
                        Promise.resolve(prom)
                            .then((vlaue) => {
                                resolve(vlaue);
                            })
                            .catch((err) => {
                                reject(err);
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                });
            }

            let arr = [5, 6, 7, 8];
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